Feature: 1. Built in Induction Coil: The receiver has a built in induction coil to receive the magnetic signal from the pipe, and the coil generates an induced current to calculate the orientation and position of the transmitter. 2. Wide Application: This product can be used in water supply pipelines, cable pipelines, pipeline vacuum systems, underground pipeline construction, underground cave exploration, underwater research and other exploration work. 3. High Efficiency: Using the 512Hz transmitter, the position of the probe can be easily determined. Save time and money and take advantage of this great feature. 4. LED Screen: This pipeline detection locator is equipped with an LED display screen. You can see the monitoring data more clearly, convenient and practical. 5. Premium Material: This 512Hz pipe receiver is made of premium ABS material, suitable for underwater survey work, rainproof and sturdy, can be used for a long time. Specification: Item Type: Sewer Camera Locator Material: ABS Gross Weight: 2049g / 72.3oz Working Frequency: 512Hz Modulation: None Batteries: 6 AA batteries (shipped without batteries) Use Time: 4 hours intermittent use Audio Output: 50-1000Hz depends on signal strength Operating Temperature: -20°C to 60°C Product Size: 548x65x50mm / 21.6x2.6x2.0in Sensor: Separate angle sensor for peak and 0 signals. Package List: 1 x Host1 x Receiver1 x Manual1 x Aluminum Case Note: The 512 has only one mode, the sonde mode. Receiver in sounding mode. Search for signals emitted by a small detector or camera with a built‑in transmitter that has been routed through a duct. The detector must emit a 512Hz signal, and the receiver can determine the approximate depth of the target.Start by turning the receiver on, walking around, keeping the receiver at waist height, and walking in the general direction of the transmitter while slowly sweeping the receiver back while pointing in the direction of the transmitter. You will notice that the signal will get bigger. As you get closer, reduce the sensitivity as needed to keep it within range. Toggle the switch to Nearby when you can't keep the meter below full scaleContinue in the direction of stronger signal. When you get to the point where the signal seems to be the strongest, whichever direction you move will make it weaker, then you know you've found a detector that's just below the center of the mast. Move to another place, look for this peak signal again, and see if you always come back to the same place for confirmation. If you followed each step correctly, you should find yourself above the launcher every time. Keep practicing until you get consistent results.The product does not include a transmitter, you need to bring your own 512HZ transmitter for use.